The objectives of this research were to provide experimental data and analytical results as input information for use in design specifications for metal-plate-connected, parallel-chord floor truss designs. The model is then used The Truss Plate Institute (TPI) has developed a design to appraise proposed applied design techniques. specification, Parallel Chord Truss Design Criteria, PCT-80 (15).1 This study presents an investigation of the precision of PCT-80 as a practical engineering tool for the design of 4 x 2 parallel-chord trusses. The principal portions of the experimental data are correlated by analyses using the Purdue Plane Structures Analyzer (PPSA) (11) in order to develop the parameters of an adequate structural model.